You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
3.6 KiB
117 lines
3.6 KiB
3 years ago
|
<!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<meta charset="utf-8" />
|
||
|
|
<base href="../../../" />
|
||
|
|
<script src="page.js"></script>
|
||
|
|
<link type="text/css" rel="stylesheet" href="page.css" />
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<h1>[name]</h1>
|
||
|
|
|
||
|
|
<p class="desc">
|
||
|
|
This buffer attribute class does not construct a VBO. Instead, it uses
|
||
|
|
whatever VBO is passed in constructor and can later be altered via the
|
||
|
|
*buffer* property.<br /><br />
|
||
|
|
It is required to pass additional params alongside the VBO. Those are:
|
||
|
|
the GL context, the GL data type, the number of components per vertex,
|
||
|
|
the number of bytes per component, and the number of vertices.<br /><br />
|
||
|
|
The most common use case for this class is when some kind of GPGPU
|
||
|
|
calculation interferes or even produces the VBOs in question.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h2>Constructor</h2>
|
||
|
|
<h3>[name]( [param:WebGLBuffer buffer], [param:GLenum type], [param:Integer itemSize], [param:Integer elementSize], [param:Integer count] )</h3>
|
||
|
|
<p>
|
||
|
|
*buffer* — Must be a <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGLBuffer" target="_blank">WebGLBuffer</a>.
|
||
|
|
<br />
|
||
|
|
*type* — One of <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Constants#Data_types" target="_blank">WebGL Data Types</a>.
|
||
|
|
<br />
|
||
|
|
*itemSize* — The number of values of the array that should be associated with
|
||
|
|
a particular vertex. For instance, if this
|
||
|
|
attribute is storing a 3-component vector (such as a position, normal, or color), then itemSize should be 3.
|
||
|
|
<br />
|
||
|
|
*elementSize* — 1, 2 or 4. The corresponding size (in bytes) for the given "type" param.
|
||
|
|
<ul>
|
||
|
|
<li>gl.FLOAT: 4</li>
|
||
|
|
<li>gl.UNSIGNED_SHORT: 2</li>
|
||
|
|
<li>gl.SHORT: 2</li>
|
||
|
|
<li>gl.UNSIGNED_INT: 4</li>
|
||
|
|
<li>gl.INT: 4</li>
|
||
|
|
<li>gl.BYTE: 1</li>
|
||
|
|
<li>gl.UNSIGNED_BYTE: 1</li>
|
||
|
|
</ul>
|
||
|
|
*count* — The expected number of vertices in VBO.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h2>Properties</h2>
|
||
|
|
|
||
|
|
<h3>[property:WebGLBuffer buffer]</h3>
|
||
|
|
<p>
|
||
|
|
The current <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGLBuffer" target="_blank">WebGLBuffer</a> instance.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h3>[property:Integer count]</h3>
|
||
|
|
<p>
|
||
|
|
The expected number of vertices in VBO.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h3>[property:Integer itemSize]</h3>
|
||
|
|
<p>
|
||
|
|
How many values make up each item (vertex).
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h3>[property:Integer elementSize]</h3>
|
||
|
|
<p>
|
||
|
|
Stores the corresponding size in bytes for the current *type* property value.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
See above (constructor) for a list of known type sizes.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h3>[property:GLenum type]</h3>
|
||
|
|
<p>
|
||
|
|
A <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Constants#Data_types" target="_blank">WebGL Data Type</a>
|
||
|
|
describing the underlying VBO contents.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
Set this property together with *elementSize*. The recommended way is
|
||
|
|
using the *setType* method.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h3>[property:Boolean isGLBufferAttribute]</h3>
|
||
|
|
<p>
|
||
|
|
Read-only. Always *true*.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h2>Methods</h2>
|
||
|
|
|
||
|
|
<h3>[method:this setBuffer]( buffer ) </h3>
|
||
|
|
<p>Sets the *buffer* property.</p>
|
||
|
|
|
||
|
|
<h3>[method:this setType]( type, elementSize ) </h3>
|
||
|
|
<p>Sets the both *type* and *elementSize* properties.</p>
|
||
|
|
|
||
|
|
<h3>[method:this setItemSize]( itemSize ) </h3>
|
||
|
|
<p>Sets the *itemSize* property.</p>
|
||
|
|
|
||
|
|
<h3>[method:this setCount]( count ) </h3>
|
||
|
|
<p>Sets the *count* property.</p>
|
||
|
|
|
||
|
|
<h3>[property:Integer version]</h3>
|
||
|
|
<p>
|
||
|
|
A version number, incremented every time the needsUpdate property is set to true.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h3>[property:Boolean needsUpdate]</h3>
|
||
|
|
<p>
|
||
|
|
Default is *false*. Setting this to true increments [page:GLBufferAttribute.version version].
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h2>Source</h2>
|
||
|
|
<p>
|
||
|
|
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
|
||
|
|
</p>
|
||
|
|
</body>
|
||
|
|
</html>
|